One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,7)(3,8,4,6)(17,18,21,26)(19,23,29,32)(20,24,30,25)(22,27,31,28)(1,3,5,4)(2,6,7,8)(9,10)(11,14)(12,13)(15,16)(17,19,21,29)(18,22,26,31)(20,27,30,28)(23,25,32,24)(1,4,5,3)(2,6,7,8)(10,13)(14,16)(17,19)(18,22)(20,27)(21,29)(23,24)(25,32)(26,31)(28,30)(9,11)(10,14)(12,15)(13,16)(17,19)(18,23)(20,28)(21,29)(22,24)(25,31)(26,32)(27,30) involution — undirected(11,15)(14,16)(17,20,21,30)(18,24,26,25)(19,27,29,28)(22,23,31,32)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.